Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f96070b1e8d535…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 09:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b01fd56aee7f3cd0f8889c66a4d4c104 SHA-1: e98c81e3f2f860d663dd755b43f3a778d1cd2702 SHA-256: a2f96070b1e8d5353946ddf997132ab46b6f27e5f43a54ad805d43b8fe7b790e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=baofeng+walkie+talkie+user+manual PDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160852690ca7cc---lifuwuwuxexepifexawepizel.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098bafe1092b---49075187905.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160baefc1b10a6---25115170979.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/87302876166.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0b3bd04479ac6f9938d05e91dd1a85ca/tejigidokomufudan.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/18792304258.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/808df8978598b1a780cbffd3a6bd5574/5001180331.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e0d29f50b---16696764290.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e545c1694b---dewemasepiluxixosotido.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1977920c---64252380838.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/vixejuxav.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3cac560ce---522822473.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210727191708_azgt0j.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/rokewefotolepek.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/77604287963.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ade49162a8a---vulijuwebe.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609689f198835---wozujujedodubutifetup.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b49887a1155---jarapomiwelofane.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/jisotifogotepovewenama.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/fapodekiwejuriwelomi.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108180103071362.pdfIn PDF document text
    • http://iltorg.ru/upload/file/33508479919.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC2 10888 bytes
SHA-256: 0022dc9d26c13292fcd4d9c5a3a2205fd30e49260d45b8b412e1330dde6ea786
font_01_sfnt_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 16460 bytes
SHA-256: 38ca9e862f88c6840fce7f8f20e6158cbb7a956f976ee208d48ea954cdb66c1f
font_02_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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